Chemistry

Question Analysis
This question tests the student's understanding of the difference between atomic mass and mass number.

Key Concept Explanation
The mass number is the total number of protons and neutrons in the nucleus and is always an integer.
The atomic mass, on the other hand, is a more precise value that accounts for the masses of protons, neutrons, and the binding energy.

Step-by-step Solution
1. Recall the definitions: Mass number (A) = number of protons + number of neutrons (integer).
2. Atomic mass = sum of the masses of...